Stein Music Maestro Lacquer

Has any one tried this product? See this review:
PreviewAg insider logo xs@2xcelander
This makes no sense why would any one want to put lacquer on they're speaker driver's this will change their mass and FR and upset the balance in the crossover and probably void any warrantee what so ever stay away from this!
I tried it. Works for me. It doesn’t add any significant mass to drivers.
I understand that it’s generally applicable to change the resonance frequency of the device to which is applied. Caps, CD’s PCB’s, driver cones etc.